SERVICE MANUALLUBRICATING OIL PUMP, OIL FILTERS & COOLERSection 8Figure 3. - Crankcase Front Cover and Lube 011Suction Tube1. Oil suction tube2. Crankcase front coverThe pump assembly with an "O" Ring sealed portingplate (1, Fig. 4) is fastened to the crankcase front coverso the forward end of the crankshaft passes through thepump. A splined sleeve (3, Fig. 4) on the crankshaftengages the inner rotor (2, Fig. 4). This drives the pumpat engine speed.Figure 4. - "GEROTOR" Lubricating Oil Pump1. Porting plate5. Pump housing2. Inner rotor6. Outer rotor3. Spline7. Oil intake4. "0" Ring/Seal Ring8. Pressure portThe inner rotor (2, Fig. 4) is concentric to the crankshaft,whereas the outer rotor (6, Fig. 4) is not. There are 14spaces in the outer rotor and only 13 teeth on the innerrotor. As the pump rotates, oil from the pan enters thepump on one side (7, Fig. 4) as the teeth leave the outerrotor. The oil is carried to the other side of the pump inthe spaces and as the teeth re-enter the spaces, the oilis forced out the pressure port (8, Fig. 4) on its way to theoil cooler.A lip-type front engine oil seal is pressed into the pumphousing and the housing is dowel pinned to the frontcover which automatically aligns the pump and seal.Two different oil pumps are used; one for theTurbocharged engines and one for the naturallyaspirated models. The basic difference is the width ofthe pump which affects the capacity. The Turbochargedengines, with two cooling jets per piston, use the larger-capacity pump.Lubricating Oil Filters:The oil filters (1, Fig. 5) are the full-flow type and areinterconnected by common internal passages in thecrankcase. One passage is for the inlet (3) and one forthe outlet (5). The filters do not have internal by-passvalves. Instead, one by-pass valve (4) located in the filterbase (2) controls the oil flow through the filters.Figure 5. - Oil Filters and Filter Base1. Oil filters2. Filter base3. Inlet passage4. By-pass valve5. Outlet passageCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 3
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
